A LibTomMath security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 23.04.

[USN-6402-1] LibTomMath vulnerability

==========================================================================
Ubuntu Security Notice USN-6402-1
October 02, 2023

libtommath vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

LibTomMatch could be made to execute arbitrary code or
denial of service if it received a specially crafted input.

Software Description:
- libtommath: multiple-precision integer library [development files]

Details:

It was discovered that LibTomMath incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code
and cause a denial of service (DoS).

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.04:
libtommath1 1.2.0-6ubuntu0.23.04.1

Ubuntu 22.04 LTS:
libtommath1 1.2.0-6ubuntu0.22.04.1

Ubuntu 20.04 LTS:
libtommath1 1.2.0-3ubuntu0.1

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
libtommath1 1.0.1-1ubuntu0.1~esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
libtommath0 0.42.0-1.2ubuntu0.1~esm1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6402-1
CVE-2023-36328

Package Information:
https://launchpad.net/ubuntu/+source/libtommath/1.2.0-6ubuntu0.23.04.1
https://launchpad.net/ubuntu/+source/libtommath/1.2.0-6ubuntu0.22.04.1
https://launchpad.net/ubuntu/+source/libtommath/1.2.0-3ubuntu0.1